Computer PSU Voltage Regulator Module (VRM)

Product Specifications

Technical details and manufacturing context for Computer Power Supply Unit (PSU) Voltage Regulator Module

Definition

A Voltage Regulator Module (VRM) is a critical sub-assembly within a computer power supply unit (PSU). Its primary industrial function is to convert and maintain stable, precise DC voltage levels from the PSU's main outputs to meet the specific requirements of sensitive computer components like the CPU, GPU, and memory. It ensures consistent power delivery despite fluctuations in input voltage or load demand, preventing damage and ensuring reliable system operation. This component is essential for the manufacturability of reliable desktop computers, servers, and workstations. The VRM typically employs a buck converter topology with pulse-width modulation (PWM) to achieve high efficiency. It includes a power MOSFET, an inductor, capacitors, and a PWM controller IC. The module's output current rating ranges from 10 to 30 A, with a switching frequency of 50–200 kHz. Output voltage ripple is kept at or below 50 mV peak-to-peak, and efficiency is typically 85–95% at rated load. The operating temperature range is -40 to 85 °C, and it operates in non-condensing humidity of 20–90% RH. The input voltage range is 90–264 V AC, suitable for global use. Output voltage accuracy is ±2%, load regulation is ±1%, and line regulation is ±0.5%. Isolation voltage is 3000 V DC per IEC 60950-1, and protection class is IP20 per IEC 60529. Weight ranges from 0.5 to 1.5 kg depending on power rating and heatsink. These parameters are reference ranges; actual values must be confirmed with the manufacturer for specific models. The VRM is designed for indoor use and is not water-protected. It is a key component in ensuring stable power delivery for reliable operation of computers and servers.

Working Principle

The VRM uses a switching regulator circuit, typically a buck converter topology, with pulse-width modulation (PWM) to rapidly switch a power MOSFET on and off. An inductor-capacitor (LC) filter smooths this switched signal into a stable, lower DC voltage, while a feedback loop continuously monitors the output and adjusts the duty cycle to maintain the target voltage. This allows efficient voltage conversion with minimal heat dissipation.

Common Materials

Ferrite Core Inductor, Multilayer Ceramic Capacitor (MLCC), Power MOSFET, PWM Controller IC

Technical Parameters

Parameter	Typical range	Notes & selection driver
Output Current RatingRequired	10–30 A	Maximum continuous current the module can supply
Switching FrequencyRequired	50–200 kHz	Operating frequency of the PWM controller
Output Voltage RippleRequired	≤50 mV p-p	Peak-to-peak AC noise on the DC output
EfficiencyRequired	85–95 %	Power conversion efficiency at rated load
Operating Temperature RangeRequired	-40–85 °C	Ambient temperature range for reliable operation
Input Voltage Range	90–264 V AC	Universal input for global use.
Output Voltage Accuracy	±2 %	Regulation tolerance over line and load.
Load Regulation	±1 %	Change in output voltage from no load to full load.
Line Regulation	±0.5 %	Change in output voltage over input range.
Isolation Voltage	3000 V DC	Input to output isolation.IEC 60950-1
Operating Humidity	20–90 % RH	Non-condensing.
Protection Class	IP20	Indoor use, no water protection.IEC 60529
Weight	0.5–1.5 kg	Depends on power rating and heatsink.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

PWM Controller IC Part
Generates the control signal for the power switches

Material: Silicon Semiconductor
Power MOSFET Part
High-speed switching element that controls power flow

Material: Silicon (or GaN/SiC for advanced models)
Output Filter Inductor Part
Stores and releases energy to smooth the switched voltage

Material: Copper wire wound on ferrite core
Output Filter Capacitor Part
Filters high-frequency noise and stabilizes output voltage

Material: Multilayer Ceramic (MLCC) or Polymer
Output Voltage Feedback Loop
Samples the output and tells the PWM controller how to change the duty cycle.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Computer Power Supply Unit (PSU) Voltage Regulator Module.

Manufacturers of Computer Power Supply Unit (PSU) Voltage Regulator Module

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

MORNSUN Guangzhou Science & Technology Co., Ltd.

Guangzhou, Guangdong, CN

IATF16949 EN60335-1 EN50155

Also makes: Transceiver Module, Transformer

Stated by the company · profile compiled by CNFX from public sources

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Frequently Asked Questions

What is the typical output current rating of this VRM?

The output current rating is typically in the range of 10 to 30 A, depending on the specific model and application. Always verify the exact rating with the manufacturer.

What is the switching frequency range?

The switching frequency is typically between 50 and 200 kHz. This affects efficiency and component size; confirm the exact frequency for your model.

What is the isolation voltage and standard?

The isolation voltage is 3000 V DC, referenced to IEC 60950-1. This is a safety standard; ensure your application meets the required isolation requirements.

What is the operating temperature range?

The operating temperature range is -40 to 85 °C. Ensure adequate cooling and environmental control to maintain reliable operation.

Data Basis

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Preliminary Technical Classification

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pressure:	Atmospheric (non-pressurized component)
other spec:	Input Voltage Range: 10V to 16V DC, Output Voltage Accuracy: ±1%, Load Regulation: ±0.5%, Ripple/Noise: 50mVp-p max
temperature:	-40°C to +85°C (operating), -55°C to +125°C (storage)

Computer Power Supply Unit (PSU) Voltage Regulator Module

Product Specifications

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